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Strongly Correlated Fermi Liquid of ^3He Adsorbed in One Dimensional Meso-Pores

一维介孔中吸附的^3He的强相关费米液体

基本信息

批准号：
10640332
负责人：
YANO Hideo
金额：
$ 1.92万
依托单位：
Osaka City University (1999, 2001)The University of Tokyo (1998)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10640332/
关键词：
Strongly correlated Fermi liquid One dimensional Fermi system Tomonaga Luttinger liquid Low dimensional quantum degeneracy 朝永-ラッティンジャー液体

项目摘要

We have studied the state of ^3He adsorbed in one dimensional mesopores regarding the quantum degeneracy and the one dimensional system. We used FSM-16 type and TW1 type as porous materials. Pore size is 18 A in diameter and 5,000 to 10,000 A in length for FSM-16 and 20 A in diameter for TW1. When ^3He particles are adsorbed on the wall of the pores, the first excited energy in the circular direction is estimated to be larger than 100 mK. This estimation indicates that the quantum state in the circular direction falls in the ground state below 100 mK. Therefore one can expect the one dimensional Fermi liquid.We measured the heat capacity of ^3He adsorbed in the mesopores. The heat capacity isotherm shows a kink at a coverage near one atomic layer. The increase in the heat capacity with coverage is larger above the coverage than that below the coverage. The heat capacity below the coverage increases with decreasing temperature below 100 mK. Above the coverage, however, the heat capacity … More decreases with temperature. The results indicate that the first atomic layer of ^3He adatoms is solid and the rests are liquid.To investigate the liquid state in detail we measured the heat capacity of ^3He adsorbed on ^4He-precoated mesopores down to 5 mK. The heat capacity of the liquid layers is proportional to temperature below 60 mK. The system of ^3He adsorbed in the mesopores is considered to be pseudo or perfect one dimensional. In the case of pseudo one dimension the temperature dependence indicates the Fermi liquid and suggests the possibility of the spin density wave at low temperatures. In our temperature range above 5 mK, however, the spin density wave was not observed. In the case of the perfect one dimension the temperature dependence indicates the Tomonaga Luttinger liquid.In summary the state of ^3He adsorbed in the mesopores is the quantum degeneracy. The results of the heat capacity suggests the one dimensional system, although we did not obtain the evidence directly. Less

我们研究了一维介孔中吸附的^3He的状态，涉及量子简并性和一维系统。我们使用FSM-16型和TW1型作为多孔材料。 FSM-16 的孔径为 18 A，长度为 5,000 至 10,000 A，TW1 的孔径为 20 A。当^3He粒子吸附在孔壁上时，圆周方向的第一激发能估计大于100 mK。该估计表明，圆周方向的量子态落在 100 mK 以下的基态。因此可以预期一维费米液体。我们测量了介孔中吸附的^3He的热容。热容等温线在一个原子层附近的覆盖范围处显示出扭结。热容随覆盖范围的增加在覆盖范围上方比覆盖范围下方更大。随着温度降低到 100 mK 以下，覆盖范围以下的热容会增加。然而，在覆盖范围之上，热容量随着温度的升高而降低。结果表明，^3He 吸附原子的第一原子层是固体，其余原子层是液体。为了详细研究液态，我们测量了 ^4He 预涂介孔上吸附的 ^3He 的热容，低至 5 mK。液体层的热容与低于 60 mK 的温度成正比。吸附在介孔中的^3He系统被认为是伪或完美的一维。在伪一维的情况下，温度依赖性表明费米液体并表明低温下自旋密度波的可能性。然而，在高于 5 mK 的温度范围内，没有观察到自旋密度波。在完美一维的情况下，温度依赖性表明 Tomonaga Luttinger 液体。总之，吸附在介孔中的 ^3He 的状态是量子简并性。尽管我们没有直接获得证据，但热容的结果暗示了一维系统。较少的